Answer:
X = 9 or x = -9
Step-by-step explanation:
We want to solve the quadratic equation
[tex] {x}^{2} - 4 = 77[/tex]
We shall use the square root method
Let us add 4 to both sides to get:
[tex] {x}^{2} - 4 + 4 = 77 + 4[/tex]
[tex] {x}^{2} = 81[/tex]
We take square to get:
[tex]x = \pm \sqrt{81} [/tex]
[tex]x = \pm9[/tex]
The solution is x=9 or -9
Answer:
B (x=9 or x=-9)
Step-by-step explanation:
Correct on EDGE
